The Poiseuille's law applicable to saturated flow in soils states that the flow of water in capillary is
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Poiseuille’s law:
\[
\boxed{
Q =
\frac{\pi r^4 \Delta P}{8\mu L}
}
\]
Very important relation:
\[
\boxed{
Q \propto r^4
}
\]
Small increase in pore radius causes a very large increase in flow.